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OBD-II/EOBD OBD Health Check
6.1.2 Global OBD II Clear Codes
This option is used to clear all emission related diagnostic data, such as DTCs, freeze frame data,
and test results, from the memory of the selected ECM. Although OBD-II/EOBD displays generic
OBD-II/EOBD data only, clearing codes erases all of the stored data, including any enhanced
codes and freeze frame information.
A confirmation screen displays when the clear codes option is selected to prevent accidental loss
of data. Select to continue from the confirmation screen. Refer to the Global OBD Vehicle
Communication Software Manual for additional information.
6.1.3 Readiness Monitors
This test checks the status of the readiness monitoring system. An OBD-II /EOBD control system
runs continuous and periodic tests to check the status of emission-related subsystems to gauge
the integrity of the electronic operations. All of the Readiness Monitors must run and complete
prior to emissions certification testing. Two options are available for Readiness Monitors:
• Monitors Complete Since DTC Cleared—displays the status of all monitors that have run
since the last time ECM memory was erased.
• Monitors Complete This Cycle—displays the status of the monitors that ran during the
current drive cycle only.
Select either option and test results are shown in the data viewer (Figure 6-3).
Figure 6-3 Sample readiness monitor test report
Scroll to view the entire list of Readiness Monitors to ensure that all tests are complete. Select
Save from the toolbar and follow the screen prompts to save a copy of the monitor report as part
of the vehicle records.
6.1.4 MIL Status
This test checks the PCM commanded state (on or off) if the malfunction indicator lamp.
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